Geopolymers Based on Phosphoric Acid and Illito-Kaolinitic Clay

Figure 4

Infrared spectra of calcined Medenine clay at 700°C, phosphoric acid 85%, aluminum phosphate, and geopolymers at different molars ratios Si/P(). (a) AlPO₄, (b) AP (85%), (c) calcined clay 700°C, (d) , (e) , (f) , (g) , (h) , and (i) .